2021 GMC Sierra 3500 HD SLT, 6.6L Eng VIN 7, 4WDFACTORY OEM SERVICE PROCEDURE

Unsuccessful Programming Recovery

If programming a control module is not successful, perform the following procedure:

  1. Verify the control module, data link connector and programming tool connections are secure and the tool software is up to date.
  2. Ignition - On / Vehicle - In Service Mode
  3. Perform the SPS function: K69 Transfer Case Control Module - Programming

    Verify the control module programming is successful.

    • If the programming is not successful 
    1. Ignition/Vehicle - Off - For greater than 1 min
    2. Ignition - On / Vehicle - In Service Mode
    3. Perform the SPS function: K69 Transfer Case Control Module - Programming
      • If the programming is not successful - Replace the component: K69 Transfer Case Control Module
      1. Replace the component: K69 Transfer Case Control Module
      2. Perform the SPS function: K69 Transfer Case Control Module - Setup
      • Go to next step: If the programming is successful
    4. Perform the SPS function: K69 Transfer Case Control Module - Setup
      • If the procedure was not successful
      1. Replace the component: A16 Transfer Case Motor
      2. Perform the SPS function: K69 Transfer Case Control Module - Setup
      • Go to next step: If the procedure was successful
    5. Perform the scan tool function: Range Actuator Learn

      Refer to: Transfer Case Range Actuator Learn

    6. All OK.
    • Go to next step: If the programming is successful 
  4. Perform the SPS function: K69 Transfer Case Control Module - Setup
  5. Clear DTCs.
  6. Perform the scan tool function: Range Actuator Learn

    Refer to: Transfer Case Range Actuator Learn

  7. All OK.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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